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Published on: March 29, 2018
Bone regeneration using cell-mediated responsive degradable PEG-based scaffolds incorporating with rhBMP-2
Fan Yang1, Jing Wang, Juan Hou
1The State Key Laboratory for Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
Biomaterials
|November 29, 2012
Summary
This study presents novel 3D temporal scaffolds that adapt their degradation rate to tissue regeneration. These scaffolds, loaded with bone growth factors, promote bone repair and vascularization in orthopedic applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Orthopedic Surgery
Background:
- Large osseous defects pose significant challenges in orthopedic surgery.
- Controlling scaffold degradation rate is crucial for effective tissue regeneration.
- Existing strategies often lack adaptability to the dynamic healing environment.
Purpose of the Study:
- To develop adaptive degradation rate scaffolds for bone regeneration.
- To utilize cell-secreted proteases as a trigger for scaffold degradation.
- To incorporate osteoinductive growth factors for enhanced bone formation.
Main Methods:
- Synthesis of disulfide-containing PEG-based scaffolds responsive to redox microenvironment.
- Incorporation of recombinant human bone morphogenetic protein-2 (rhBMP-2) for osteoinduction.
- In vitro degradation studies using reduced glutathione (GSH) and in vivo studies in rabbit bone defect models.
Main Results:
- Scaffold degradation rate was tunable from 0.5 hours to 22 days based on GSH concentration and polymer composition.
- rhBMP-2 loaded scaffolds induced ectopic bone formation in mice.
- In rabbits, scaffolds promoted bone regeneration, vascularization, and bone marrow cavity reunion, outperforming self-repair.
Conclusions:
- The developed 3D temporal scaffolds offer controlled degradation and osteoinduction for enhanced bone augmentation.
- This strategy shows promise for orthopedic applications requiring adaptive tissue regeneration.
- The combination of controlled degradation and growth factor delivery is key for effective bone repair and vascularization.
